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2013 ; 97
(6
): 1163-77
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Management of protein-energy wasting in non-dialysis-dependent chronic kidney
disease: reconciling low protein intake with nutritional therapy
#MMPMID23636234
Kovesdy CP
; Kopple JD
; Kalantar-Zadeh K
Am J Clin Nutr
2013[Jun]; 97
(6
): 1163-77
PMID23636234
show ga
Protein-energy wasting (PEW), characterized by a decline in body protein mass and
energy reserves, including muscle and fat wasting and visceral protein pool
contraction, is an underappreciated condition in early to moderate stages of
chronic kidney disease (CKD) and a strong predictor of adverse outcomes. The
prevalence of PEW in early to moderate CKD is ?20-25% and increases as CKD
progresses, in part because of activation of proinflammatory cytokines combined
with superimposed hypercatabolic states and declines in appetite. This anorexia
leads to inadequate protein and energy intake, which may be reinforced by
prescribed dietary restrictions and inadequate monitoring of the patient's
nutritional status. Worsening uremia also renders CKD patients vulnerable to
potentially deleterious effects of uncontrolled diets, including higher
phosphorus and potassium burden. Uremic metabolites, some of which are
anorexigenic and many of which are products of protein metabolism, can exert
harmful effects, ranging from oxidative stress to endothelial dysfunction, nitric
oxide disarrays, renal interstitial fibrosis, sarcopenia, and worsening
proteinuria and kidney function. Given such complex pathways, nutritional
interventions in CKD, when applied in concert with nonnutritional therapeutic
approaches, encompass an array of strategies (such as dietary restrictions and
supplementations) aimed at optimizing both patients' biochemical variables and
their clinical outcomes. The applicability of many nutritional interventions and
their effects on outcomes in patients with CKD with PEW has not been well
studied. This article reviews the definitions and pathophysiology of PEW in
patients with non-dialysis-dependent CKD, examines the current indications for
various dietary modification strategies in patients with CKD (eg, manufactured
protein-based supplements, amino acids and their keto acid or hydroxyacid
analogues), discusses the rationale behind their potential use in patients with
PEW, and highlights areas in need of further research.